Rounding the back puts unequal pressure on the discs (especially lumbar region). (pic 1). Overtime, an accumulation of rounding the back starts to compromise the disc (bad form over and over and over again). The disc (nucleus pulposus) can start to bulge (see pic 2). Of course, then any action can cause a severe bulge or even burst, at this point it could be Deadlifting or simply bending over to tie one's shoe (pic 3).What to do?
Identify the times you "round" through the day (picking up the paper, sitting at your desk, lifting DBs, etc)...and practice not doing it.
Work the Backside. A strong lower back helps to maintain the lumbar curve. Similarly, the hamstrings are responsible for keeping the hips vertical (especially in a squat) which keeps the spine tall.
Unlock the Hip Flexors. Tight hip flexors overpower hamstrings and encourage loss of lumbar curve.
Head up Chest Out.
If you feel disc-related pain, stop and consult a physician. Many slight herniations can be re-absorbed by the body with rest and proper stretches/exercises.
(As in, do not confuse any of this with medical advice. If you have concerns about back pain, consult an appropriate medical professional.)
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